Two of the three plutonium production reactors that Russia still operates, will be shut down about six months ahead of schedule. The reactors, located at Seversk/Tomsk-7, will stop operations in summer, not at the end of 2008, as it was previously planned. The third plutonium production reactor, in Zheleznogorsk/Krasnoyarsk-26, will be shut down after 2010.

Together, three reactors were estimated to produce about 1.2 tonnes of weapon-grade plutonium annually, although Russia reported that that in recent years the reactors in Seversk operated at about half of their capacity, producing less plutonium.

For what reason Russia operates these reactors so long? I mean there should be enough weapon-grade Pu from dismantled weapons to produce new warheads in big numbers.
As far as I know (Frank, please correct me if I´m wrong) the US shut down Pu production in the mid 90´s and HEU procution in the 60´s.
Or are these reactors also used to produce Pu238 for inteligence and space applications?